The best thing in this dish is not the chorizo, it is the fat that comes out of it. Everything after step one is cooked in that, and it is why the stew tastes like it simmered all afternoon.
Use barely any oil at the start. The sausage provides most of it.
- Slice the chorizo into thin coins. Cold pan, the merest film of oil, medium heat: starting cold is what draws the fat out rather than searing it in. Five or six minutes until the coins have curled and the pan is deep red.
- Lift the chorizo out and leave the fat. Dried onion into it for two or three minutes, then garlic and paprika for twenty seconds.
- Tomatoes in. Cook them down hard for ten minutes until the colour turns from red to brick: this is where the depth comes from and it is the step people cut short.
- Chickpeas with about half their liquid. Simmer 15 minutes, pressing some against the side of the pan so they thicken the stew.
- Chorizo back in for the last two minutes, then the vinegar off the heat.
Taste before adding any salt. Between the chorizo and the chickpea liquid there is usually enough.
Serves 4 with bread, 2 as a main on its own.